8 Kolobrzeska, Bydgoszcz, Poland
Wisłoujście Fortress (Polish: Twierdza Wisłoujście) is the oldest seaside fortress on the Polish coast it was situated at the main entrance to Gdańsk harbour. Various architectural styles (starting with Gothic), techniques and building materials can be seen in the construction of the fortress. This is due to the fact that over the years the fortress has been rebuilt after each destruction. In the early modern period, it was called the Gate to the Republic of Poland. The imposing fortification protected ships on their way to the Gdańsk port. It also acted as a lighthouse, a mooring place for the Polish fleet and a prison. Nowadays, it is a branch of Museum of Gdańsk City. It is opened for visitors from May till September. Every year, reconstruction groups and historians organize here sea battles, workshops of old crafts, conferences and lectures. Finally, it is one of the largest wintering grounds for bats in the Pomeranian Region.
